THE TRANSITION SERIES. 41 



as though the mass had been torn up by and floated on the igneous rock. 

 It is not a remnant of deposition on the trap, though it at first sight 

 looks like this, but is cut off across the strike by the intruded rock. 



Buff and blue waxy quartzites occur again in and on the long ridge to 

 the west-north-west of Bonagudapolliam, striking north-north-west and 

 dipping vertically into the trap of the south-west side of the ridge. The 

 main backbone of the ridge is of these quartzites, but they are crossed 

 by very large trap dykes in west-by-north or west-north-west directions. 

 The south-west end of the ridge is nearly altogether of compact, occa- 

 sionally flaggy, buff and grey waxy quartzites striking west-by-north or 

 west-north-west with a dip of 70° or 80° southwards, lying on a great 

 mass of trap below which are hornblendic and quartzose schists of the 

 gneiss series striking north-north-west and dipping irregularly. 



The southern end of the low ridge due east of Kandra is of massive 

 trap, twisted beds of quartzite similar to those of Chillamanchen beino 1 

 on its north side. In passing from the trap to the quartzites I crossed a 

 heterogeneous mass of outcrops of hornblendic schists (or schistose trap) 

 and quartzites without any appearance of parallelism between them. 

 The idea given is rather that of broken outcrops of the quartzites with 

 the intermediate gaps filled in by a schistose trap rock. 



A low ridge lying between Kandra and Thimmasamvidrum is partly 

 made up of coarse grey quartzites traversed by or lying among dykes of 

 massive compact trap, but the relations of the rocks is much obscured by 

 the enormous amount of quartzite debris, for which reason also the 

 direction of the dykes cannot be made out. The false-bedded quartzite 

 sandstones are contorted, but have a general east-west strike., At the 

 eastern end of the ridge about north-north-west of Kandra the beds are 

 wholly cut off by a great dyke of aphanite running west-by-south to 

 east-by-north. 



The southern end of the Kanakandroyan ridge, consisting of two 

 detached hills, is a great mass or plexus of trap dykes, with an east- west 

 band of vertical quartzite strata. The smaller hill south-west of Con- 

 dagunta is part of a great dyke, having on its south side a broadish band 



( 149 ) 



